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Microchip Technology 1N5346BE3/TR8
- Part No.:
- 1N5346BE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346BE3/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,583
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Product details
Overview
1N5346BE3/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V ±5%, maximum dynamic impedance of 2.0 Ω at 150 mA test current, and maximum reverse leakage of 7.5 µA at 6.6 V. It operates across –65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5346BE3/TR8 datasheet, 1N5346BE3/TR8 pinout, 1N5346BE3/TR8 application, or 1N5346BE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (520 A), voltage regulation (ΔVZ = 0.22 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown. Its 9.1 V nominal Zener voltage is specified at 150 mA (IZT), with tight ±5% tolerance ensured by the 'B' suffix and RoHS compliance confirmed by the 'e3' suffix. The TR8 tape-and-reel packaging supports automated assembly.
Thermal design relies on low junction-to-lead thermal resistance (25 °C/W at 10 mm lead length) and high steady-state power capability (5.0 W at TL < 25°C). It exhibits minimal voltage variation (ΔVZ = 0.22 V) between 10% and 50% of IZM, enabling stable regulation under varying load currents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - precise regulation point for feedback networks and reference circuits |
| Power Dissipation | 5.0 W at TL < 25°C - supports high-current regulation with adequate heatsinking |
| Test Current (IZT) | 150 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.0 Ω max at IZT - ensures low output impedance and minimal voltage shift under load changes |
| Reverse Leakage (IR) | 7.5 µA max at VR = 6.6 V - guarantees low standby power loss in bias and sensing applications |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation stability |
| Surge Current (IZSM) | 520 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Operating Temperature | –65°C to +150°C - suitable for industrial, automotive, and aerospace environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free thermosetting epoxy, UL94V-0 rated), cathode indicated by band. Leads are annealed matte-tin plated (RoHS compliant), solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-bias operation | Connected to circuit ground or lower potential node when used as shunt regulator |
| Cathode | Zener breakdown terminal / high-voltage side in reverse-bias operation | Banded end; connected to unregulated input rail to clamp voltage at 9.1 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB series mechanical and electrical specifications |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to reflow |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - robust against electrostatic discharge during assembly |
| High Surge Withstand | Rated for 520 A non-recurrent 8.3 ms half-sine surge - protects downstream circuitry |
| Low Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables efficient heat transfer to PCB or heatsink |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback path using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 9.1 V threshold for error signal generation. Use Value: Maintains ±1% output regulation across line/load/temperature due to low ΔVZ (0.22 V) and stable VZ tolerance (±5%). | Use Scenario: Clamps input rail to prevent damage to downstream regulators or microcontrollers during transient surges. IC Role / Device Role / Timing Role: Passive crowbar element conducting only above 9.1 V to divert excess energy. Use Value: Survives 520 A surge events without degradation, ensuring long-term reliability in harsh environments. |
| Industrial Sensor Excitation | Programmable Reference Source |
Use Scenario: Provides stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage source referenced to system ground, minimizing common-mode noise coupling. Use Value: Delivers 9.1 V with <0.22 V drift over 10–50% IZM range, improving sensor measurement resolution and repeatability. | Use Scenario: Serves as adjustable reference in DAC-based calibration systems where multiple Zeners set discrete thresholds. IC Role / Device Role / Timing Role: Fixed-voltage node enabling ratiometric comparison against programmable DAC outputs. Use Value: Tight ±5% tolerance and low ZZ (2.0 Ω) ensure accurate threshold setting without external trimming components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | No TR8 tape-and-reel packaging; bulk or ammo-pack only; same electrical specs | Lacks automated placement compatibility; requires manual or vibratory bowl feeding | Select when hand-soldering or low-volume prototyping is used |
| MMSZ5240B-TP | Surface-mount SOD-123 package; 9.1 V ±5%; 500 mW rating; higher ZZ (10 Ω) | Not drop-in compatible; limited power handling (0.5 W vs. 5.0 W); unsuitable for high-current regulation | Select only for space-constrained, low-power designs where thermal mass is not critical |
Compared with 1N5346B and MMSZ5240B-TP, the 1N5346BE3/TR8 uniquely combines high-power 5.0 W capability, axial-leaded through-hole mounting for mechanical robustness, and TR8 tape-and-reel for high-volume SMT assembly-making it optimal for industrial power supplies requiring both reliability and manufacturability.
Availability
1N5346BE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply and long-term lifecycle support.
Supply support for 1N5346BE3/TR8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized voltage regulation in high-stress power systems, emphasizing thermal performance, surge resilience, and JEDEC-standardized mechanical compatibility.
FAQ
What is the Zener voltage tolerance of the 1N5346BE3/TR8?
The 1N5346BE3/TR8 has a Zener voltage tolerance of ±5%, indicated by the 'B' suffix in its part number. This means its nominal 9.1 V regulation voltage falls within 8.65 V to 9.55 V at 25°C when tested at 150 mA. The 'e3' suffix confirms RoHS compliance, and 'TR8' denotes tape-and-reel packaging per EIA-296 standard. This tolerance is tighter than the ±10% 'A' suffix and looser than the ±2% 'C' variant.
How does thermal resistance affect the 1N5346BE3/TR8's power handling?
The 1N5346BE3/TR8 has a junction-to-lead thermal resistance of 25 °C/W at 10 mm lead length, enabling full 5.0 W dissipation only when leads are adequately heatsunk. On FR4 PCB (1 oz Cu, 4 mm² pads), its junction-to-ambient resistance rises to 85 °C/W, limiting steady-state power to 1.47 W at 25°C ambient. Engineers must use this data to size copper pour or external heatsinks to avoid exceeding the 150°C max junction temperature.
Can the 1N5346BE3/TR8 replace the 1N5346B in existing designs?
Yes-the 1N5346BE3/TR8 is a direct functional and mechanical replacement for the 1N5346B, sharing identical electrical specifications, T-18 package dimensions, and axial-leaded pinout. The only differences are the 'e3' RoHS-compliant plating and 'TR8' tape-and-reel packaging. No PCB or schematic changes are needed; only feed mechanism settings require update for automated placement.
What is the maximum surge current rating for the 1N5346BE3/TR8?
The 1N5346BE3/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 520 A, defined as the peak of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without parametric shift or catastrophic failure. It is validated per JEDEC standards and supports robust overvoltage protection in industrial power rails subject to lightning-induced or switching transients.
Is the 1N5346BE3/TR8 suitable for high-reliability aerospace applications?
The base 1N5346BE3/TR8 is not screened to aerospace standards, but Microsemi offers MIL-PRF-19500 qualified versions (e.g., JANTXV-1N5346B) by adding MQ/MX/MV prefixes. These undergo rigorous environmental testing including temperature cycling, hermeticity, and radiation hardness. For flight-critical systems, engineers must specify the appropriate military-grade variant-not the commercial e3/TR8 version-while retaining identical Zener characteristics.
1N5346BE3/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 6.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- T-18
1N5346BE3/TR8 FAQ
1.How can I place an order for 1N5346BE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346BE3/TR8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N5346BE3/TR8 reliable?
The price and inventory of 1N5346BE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346BE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346BE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346BE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346BE3/TR8?
1N5346BE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346BE3/TR8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N5346BE3/TR8?
For technical support, including 1N5346BE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346BE3/TR8 requirements.
6.How does Aetrix verify that 1N5346BE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346BE3/TR8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N5346BE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346BE3/TR8?
All 1N5346BE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346BE3/TR8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N5346BE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5346BE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346BE3/TR8 Tags
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